code: def test_wasb_log_exists(self, mock_hook):
      instance = mock_hook.return_value
      instance.check_for_blob.return_value = True
      self.wasb_task_handler.wasb_log_exists(self.remote_log_location)
      mock_hook.return_value.check_for_blob.assert_called_once_with(
          self.container_name, self.remote_log_location
      )
  
imports: from __future__ import annotations
  import copy
  import os
  import tempfile
  from pathlib import Path
  from unittest import mock
  import pytest
  from azure.common import AzureHttpError
  from airflow.providers.microsoft.azure.hooks.wasb import WasbHook
  from airflow.providers.microsoft.azure.log.wasb_task_handler import WasbTaskHandler
  from airflow.utils.state import TaskInstanceState
  from airflow.utils.timezone import datetime
  from tests.test_utils.config import conf_vars
  from tests.test_utils.db import clear_db_dags, clear_db_runs
label_desc: Use image node_id 7 for calling the TestWasbTaskHandler obj's underlying member method code with example usage: obj.test_wasb_log_exists(mock_hook) without return types